Implement instance script for Zul'Farrak and prevent Gahz'Rilla from being summoned multiple times.

--HG--
branch : trunk

sql/FULL/world_scripts_full.sql

@@ -1435,6 +1435,7 @@ UPDATE `creature_template` SET `ScriptName`='npc_weegli_blastfuse' WHERE `entry`
 UPDATE `gameobject_template` SET `ScriptName`='go_shallow_grave' WHERE `entry` IN (128308,128403);
 INSERT IGNORE INTO `areatrigger_scripts` (`entry`, `ScriptName`) VALUES('962','at_zumrah');
 UPDATE `gameobject_template` SET `ScriptName`='go_table_theka' WHERE `entry`=142715;
+UPDATE `instance_template` SET `ScriptName`='instance_zulfarrak' WHERE `map`=209;
 
 /* ZUL'GURUB */
 UPDATE `instance_template` SET `script`='instance_zulgurub' WHERE `map`=309;